问题描述：
After I ( ) my homework,I went out to an aquariom.选项如下
A was doing
B did
C does
D would do
为什么？
A was doing
B did
C does
D would do
为什么？
问题解答：
我来补答展开全文阅读
问题描述：
问题解答：
我来补答